薄荷、藿香、钩藤类药的煎煮方法是（）。 A.先煎 B.后下 C.烊_爱下问搜题

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问题单项选择题 A1/A2型题

薄荷、藿香、钩藤类药的煎煮方法是（）。

A.先煎

B.后下

C.烊化

D.包煎

E.另煎

答案

参考答案：B

选择题

已知等差数列{a_n}的公差为正数，且a₃·a₇＝－12，a₄＋a₆＝－4，则S₂₀为

A．180

B．－180

C．90

D．－90

选择题

John was given the same suitcase his father and grandfather ____ with them to school.

A. took
B. had taken
C. were taking
D. would take