气瓶减压器的螺杆等沾有油脂时，必须用（）洗刷干净。
A.汽油
B.四氯化碳
C.酒精
参考答案：B
Jimmy can't buy any new books because he has _____ his money. [ ]
A. sold out
B. run out of
C. come out
根据儿童Crohn病活动指数的判断标准，不活动的积分应为（）
A.≤10
B.≤20
C.≤30
D.≥11
E.≥30
