如果小齿轮是主动轮，它的转速经大齿轮输出时就（）。
A.降低了
B.提高了
C.不变
参考答案：A
With all the novels he was interested in ___, he left the library and went back to his dorm.
A．borrowed
B．borrowing
C．to borrow
D．borrow
下述药物中毒引起低血压，须禁用肾上腺素的是
A．苯巴比妥B．地西泮C．氯丙嗪D．水合氯醛E．吗啡
