Last Saturday, we made the cards _____ hand. [ ]
A. of
B. by
C. about
D. with
答案:B
患者,女,35岁。经常怕冷,四肢凉,得温可缓,面色白,舌淡嫩,脉沉迟无力。应属()
A.恶风
B.恶寒
C.畏寒
D.寒战
E.实寒
图示电路在开关S闭合后的时间常数τ值为:()
A.0.1s
B.0.2s
C.0.3s
D.0.5s