燃料气中固体含量以重量含量计应低于()。
A、30ppm
B、25ppm
C、20ppm
D、35ppm
参考答案:A
The audience ______ to see who would win the gold medal.
A.took a deep breath
B.held their breath
C.lost their breath
D.was out of breath
与加味逍遥散联用起协同增效作用的药物是
A.青霉素B.抗生素类药物C.抗肿瘤药D.阿托品E.甲巯咪唑