在沟槽端部,降水井外延长度应为沟槽宽度的()倍。
A.0.1~0.5
B.0.5~0.8
C.0.8~1.0
D.1~2
参考答案:D
中药品质变异现象之一是
A.含水太多
B.杂质多
C.变味
D.破碎
E.结块
Several professors from Peking University came to visit our school, to my surprise, one of ________ was my aunt.
A.them
B.those
C.which
D.whom