电动机运转时间限制器动作后，恢复电梯正常运行只能通过手动复位。恢复断开的电源后，曳引机无需保持在停止位置。（）
参考答案：对
组成脑干的是（）。
A.中脑、脑桥和延髓
B.间脑、小脑
C.中脑、脑桥
D.间脑、脑桥
E.脑桥、延髓
用单词的适当形式填空。
1. The _____ (第29届) Olympic Games were held in Beijing on August 8th, 2008.
2. We are having a school trip this Sunday. We feel ______ (exciting).
3. It rained ______ (heavy), so he didn't go to work yesterday.
4. Tom ______ (beg) his mother for another 10 yuan yesterday.
5. His bag is blue. ______ (I) is red.
