出口羊毛通常采用 ______ 计算重量。
A．毛重 B．净重C．公量 D．理论重量
参考答案：C
以有效成分制成的中药注射剂，其有效成分的纯度应（）
A.≥70%
B.≥80%
C.≥90%
D.≥60%
E.≥65%
Lucy had few close friends. So she didn’t know ________ about the trouble.
A．who to talk
B．who to talk to
C．who to say
D．what to talk
