分离流感病毒可采取的标本为急性期患者的()或()
参考答案:咽漱液;鼻咽拭子
Tom has to leave now _________ he can catch the train.
A.so that
B.as soon as
C.because
D.if
低淬透性冷作模具钢的变形比低变形冷作模具钢()。
A.大
B.一样
C.小