________ in the mountains for a week, th

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问题选择题

________ in the mountains for a week, the two students were finally saved by the local police. [ ]

A. Having lost

B. Lost

C. Being lost

D. Losing

答案

答案：B

单项选择题

补钾时液体配制的最安全浓度为()

A．10%氯化钾15ml+5%葡萄糖溶液250ml

B．10%氯化钾30ml+10%葡萄糖溶液500ml

C．15%氯化钾30ml+5%葡萄糖溶液1000ml

D．15%氯化钾20ml+10%葡萄糖溶液500ml

E．10%氯化钾15ml+5%葡萄糖溶液500ml

单项选择题

列车监控装置的电控阀、放风阀和（）3大部分组成

A.紧急风缸

B.延时风缸

C.降压风缸