()是一种能耐高温的材料,如果在还原性气氛中,2000℃时其强度反而较常温时提高一倍,3900℃(常压下)时升华为气体。
A、钨
B、钼
C、钽
D、石墨
参考答案:D
中药不良反应包括中药材、中成药和中药饮片引起的不良反应,涉及 __________ 、后遗效应、 __________ 、继发反应、特异性反应等。
— I think teenagers should be allowed to have part-time jobs.
— _____. Studying is more important for them. [ ]
A. I think so
B. I disagree with you
C. Me, too
D. No problem