下列各项中哪些符合“救生艇安全操作须知”的要求（）。
Ⅰ航行中放艇由船长掌握放艇时机；
Ⅱ港内放艇应事先得到港监部门的批准；
Ⅲ操艇人员非机动艇不少于5人，其中驾驶员一人任艇长；
Ⅳ航行中放艇时，随艇下的人员不多于3人。
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A.自动化 B.程序化 C.数字化 D. 网络管理 [单项选择]含有金属元素的维生素是（）
A. 维生素B1 B. 维生素B2 C. 维生素B6 D. 维生素B12 E. 叶酸 [多项选择]地面、墙壁、家具消毒可用下列哪些溶液擦拭（）
A. 1%～3%含氯石灰溶液 B. 0.2～0.5%过氧乙酸溶液 C. 1000mg/L～2000mg/L含氯消毒剂 D. 0.2%氯己定溶液 E. 0.5%氯胺T溶液 [单项选择]以下是阴道清洁度评定的项目，但除外
A. 白细胞 B. 红细胞 C. 上皮细胞 D. 杆菌 E. 球菌 [单选题]单相半波可控整流电路,在感性负载的情况下,若一个周期内流过晶闸管的平均电流等于流过续流二极管的电流时,晶闸管的导通角应为( )。
A.180° B.120° C.90° D.60° [单选题]以下说法正确的是（ ）。
A.民用航空安全保卫人员如有故意犯罪记录，则不能通过背景调查 B.民用航空安全保卫人员如其父母有故意犯罪记录，则本人不能通过背景调查 C.民用航空安全保卫人员如其配偶有故意犯罪记录，则本人不能通过背景调查 D.民用航空安全保卫人员如其兄妹有故意犯罪记录，则本人不能通过背景调查 [判断题]出站、发车进路信号机须设引导信号。
A.正确 B.错误 我来回答: 提交
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