甲型肝炎可呈食物型或水型爆发流行
输血后肝炎仅见于乙型肝炎
体液传播是HBV、HDV和HCV的主要传播途径
母婴垂直传播主要见于乙型肝炎
| Curt Dunnam bought a Chevrolet Blazer
with one of the most popular new features in high-end cars: the OnStar personal
security system. The heavily advertised communications and tracking feature is used nationwide by more than two million drivers, who simply push a button to connect, via a built-in cellphone, to a member of the OnStar staff. A Global Positioning System, or G. P. S. , helps the employee give verbal directions to the driver or locate the car after an accident. The company can even send a signal to unlock car doors for locked-out owners, or honk the horn to help people find their cars in an endless plain of parking spaces. The biggest selling point for the system is its use in thwarting car thieves. Once an owner reports to the police that a car has been stolen, the company can track it to help intercept the thieve A. point out the worries caused by OnStar B. promote the brand and sale of OnStar C. introduce the new features of OnStar D. show the future trend represented by OnStar [单选题]轮椅搁脚板的高低以足踏在板上，（）为宜。
A.大腿呈前倾位 B.小腿呈前倾位 C.大腿呈水平位 D.小腿呈水平位 [单选题]男婴，营养状况良好，体重7kg，能坐，前囟2cm×2cm。
其头围大约为
A.34cm B.40cm C.44cm D.46cm E.48cm [简答题]什么是数字数据传输？
[判断题]装配过程中应保持零件的清洁,不得有油渍;主轴密封装置动、静环端面及密封圈表面等,应无异物、灰尘。( )
A.正确 B.错误 [多选题]在我国财政收入中，国有资产收益的具体形式包括( )。
A.税收 B.股息 C.规费 D.资金使用费 E.红利 [判断题]海关接受申报后,报关单证及其内容不得修改或者撤销,但符合海关规定情形的除外。
A.正确 B.错误 [多选题]按操作方法的不同，气体保护焊可分为( )。
A.手工气体保护焊 B.半自动气体保护焊 C.自动气体保护焊 D.非熔化极气体保护焊 E.熔化极气体保护焊 [判断题]第八条 ( ) 数据的采集、处理、存储、生成、检索、报告等活动,应当满足相应数据类型的记录填写或数据录入的要求,保证数据真实、准确、完整和可追溯。()
A.正确 B.错误 [单选题]用二甲酚橙作指示剂，EDTA法测定铝盐中的铝常釆用返滴定方式，原因不是（）。
A.A.不易直接滴定到终点 B.B.A13+易水解 C.C.A13+对指示剂有封闭 D.D.配位稳定常数<108 [单选题]互联电网各方应在联网前签订（ ）。
A.《电网调度协议》 B.《互联电网调度协议》 C.《互联方调度协议》 D.《各方调度协议》 [单项选择]空腹血浆中的主要脂蛋白，运输胆固醇到肝外组织的主要运载工具的是（）
A. VLDL—ch B. TC C. TG D. LDL—ch E. HDL—ch [单项选择]矿山、建筑施工单位和危险物品的生产、经营、储存单位，以及从业人员超过( )人的其他生产经营单位，必须配备专职的安全生产管理人员。
A. 200 B. 300 C. 400 D. 500 [简答题]空冷器的投用原则是什么？
[判断题]同一目录下,可以建立两个同名的子目录。( )
A.正确 B.错误 [单项选择]
Get Right Amount of Vitamin D Vitamin D helps bones and muscles grow strong and healthy. Low levels of vitamin D can lead to problems like rickets and osteoporosis. Rickets is a deformity mainly found in children. Osteoporosis is the thinning of bone, a common problem as people, especially women, get older. Studies in recent years have suggested that vitamin D may also have other uses. Studies have shown that low levels of D may increase the risk of heart attacks in men and deaths from some cancers. Other studies have shown that people with rheumatic diseases often have low levels of D. The easiest way to get vitamin D is from sunlight. The ultraviolet rays react with skin cells to produce the vitamin. But many people worry about skin cancer and skin damage from the sun. Also, darker skinned people produce less vitamin D than lighter skinned people. Production also decreases in older people and those living in northern areas that get A. two hundred international units from birth through age fifteen. B. six hundred international units for those older than seventy. C. six hundred international units through age seventy. D. four hundred international units through age sixty. [单选题]分布式光伏发电实行“(____)、就近消纳、电网调节”的运营模式。
A. 全部自用 B. 自发自用、余电上网 C. 全部上网 D. 混合模式 [单选题]根据《国家民用航空安全保卫方案》的规定，运送遣返人员的信息，应当在运输（ ）小时前通知公共航空运输企业。
A.12 B.24 C.48 D.72 [判断题]采用直接分配法分配辅助生产费用时，辅助生产车间之间相互提供产品或劳务也应计算其应负担的金额。
[单选题]【单选】
#5炉喘振报警值：A送风机（）Pa；B送风机（）Pa。 A.2360，2280 B.2360，2200 C.2460，2280 D.2460，2200 [多选题]本办法所称员工，包括
A.合同制员工 B.非全日制员工 C.劳务派遣制员工 D.内退员工 [单选题]在Word编辑环境中，可以对文档进行分栏，最多可以将文档分成（ ）。
A.二栏 B.三栏 C.四栏 D.四栏以上 [多选题]( )等可通过呼吸系统侵入人体,导致中毒。
A. 氯气 B. 氨气 C. 硫化氢 D. 一氧化碳 [多选题]油机启动电池液面检查时应注意( )。
A.A-不准用手电 B.B-不准吸烟 C.C-不准用打火机 D.D-应戴防护眼镜 [单项选择]下列关于西文和汉字编码的叙述中，错误的是（）
A. 一个ASCII码在内存中占一个字节 B. GB2312汉字的机内码是2个字节，每个字节的最高位均为0 C. GBK与GB2312保持兼容 D. GB18030汉字编码长度是1、2或4个字节 [判断题]单网覆盖区域BTS及直放站近端机不能正常提供业务超过6小时为一类障碍。( )
A.正确 B.错误 我来回答: 提交
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