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