这个标志的含义是提醒车辆驾驶人前方是无人看守铁路道口。
参考答案:错
用所给单词的适当形式填空。
1. He was a natural leader, and when he ____ (command), everyone obeyed.
2. Theory ____ (base) on practice and in turn serves practice.
3. I am just ____ (request) that you keep him safe.
4. The girl ____ (recognize) her father and cried at once.
5. The meeting ____ (expect) to end in the morning.
给鼻饲病人更换胃管,要求()。
A.每天更换,晚上拔管,次晨插管
B.每周更换,晚上拔管,次晨插管
C.每周更换,上午拔管,晚上插管
D.每天更换,上午拔管,晚上插管
E.每天更换,上午拔管,次晨插管