Increasingly, over the past ten years,
people—especially young people—have become aware of the need to change their
eating habits, because much of the food they eat, particularly processed food,
is not good for the health. Consequently, there has been a growing interest in
natural foods. Foods which do not contain chemical additives (添加剂) and which have not been affected by chemical fertilizers, widely used in farming today. (79) {{U}}Natural foods, for example, are vegetables, fruit and grain which have been grown in soil that is rich in organic (有机的) matter. {{/U}}In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which A. they are fed on food which is little better than garbage B. they live in very crowded condition C. the eggs they lay lack vitamins D. they are allowed to move about and eat freely [单选题]采用施工特定行车办法行车,遇列车不具备通过条件时,应使列车( )。
A.通过 B.机外停车 C.紧急制动 D.及时拦停 [判断题]硬质梯子的横档应嵌在支柱上,梯阶的距离不应大于60cm。( )
A.正确 B.错误 [单选题]风险评价不需要对危险源导致的风险进行()。
A.分析 B.评估 C.分级 D.管控 [多项选择]铁路工程在黄土地区应遵循下列( )原则。
A. (A) 应采用以钻探为主的勘探方法 B. (B) 勘探深度及取样应满足地基稳定性评价的需要 C. (C) 非自重湿陷性黄土场地,勘探深度应至全部湿陷性土层底面 D. (D) 黄土隧道勘探孔宜布置在中心线两侧5~7 m处,孔深应至路基面以下3 m [判断题]车站作为列车径路中一个点,其接发列车进路变更属于变更列车径路。()
A.正确 B.错误 [单选题]肝硬化腹水产生的机制为( )
A.脾功能亢进 B.血浆清蛋白增多 C.门静脉压力增高 D.醛固酮分泌减少 E.肾小球滤过增加 [判断题]氢氟酸成品槽可通过槽车机台将酸性水打至酸性水槽()
A.正确 B.错误 [单选题]铅酸蓄电池放电电流大于10h放电率电流时,电池的放电容量将( )。
A.增大 B.减小 C.不变 D.无规律变化 [单项选择]短时记忆中的容量单位是( )。
A. 比特 B. 字节 C. 组块 D. 词 [判断题]行车设备故障耽误本列客运列车1小时以上构成D21类事故。
A.正确 B.错误 [判断题]由于铸铁的抗拉强度、塑性、韧性和焊接性能较差,所以适合制作各类重要零件。
A.正确 B.错误 [单选题]哺乳动物核糖体大亚基的沉降常数是( )。
A.40S B.70S C.30S D.80s E.60S [单项选择]无产阶级专政的实质就是
A. 无产阶级作为统治阶级掌握国家政权 B. 消灭剥削、消灭阶级,最终实现共产主义 C. 镇压敌对阶级的反抗 D. 领导和组织社会主义建设 [填空题]How long does it take for him/her to go from the house to the shopping center
It takes only ______ on foot.
[单项选择]进气系统零件不包括()
A. 压力调节器 B. 空气阀 C. 节气门本体 D. 空气流量计 [单项选择]
某机电公司承包了某化工厂的设备及管道的防腐蚀工程。由于设备表面还存有铁锈和旧的防腐层,必须对设备进行预处理。工程防腐蚀涂层采用刷涂的施工方法,防腐蚀衬里采用聚氯乙烯塑料衬里。施工完毕,经总工程师鉴定,由于此工程质量要求很高,防腐蚀采用刷涂后,设备表面不够均匀和平整,于是对设备表面重新进行预处理,采用另一种涂层方法。工程施工完毕,达到设计要求后,交付使用。 真空操作的设备、受振动和有冲击的设备不宜采用( )。A. 硬聚氯乙烯塑料衬里 B. 软聚氯乙烯塑料衬里 C. 铅衬里 D. 橡胶衬里 [单选题]具有情境性、简略性、反应性特点的言语形式是( )
A.书面言语 B.独白言语 C.对话言语 D.内部言语 [单项选择]为了保证种公猪的营养,其蛋白质水平为()。
A. 13-14% B. 14-15% C. 15-16% D. 16-17% 我来回答: 提交
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