题目内容

下列灌浆设备中，属于手动灌浆设备的是（）。

A. 推压式灌浆枪
B. 螺杆灌浆泵
C. 按压式灌浆枪
D. 气动灌浆器

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促性腺激素种类很多，根据其分泌和产生的主要腺体和组织可分为和两大类。

What is concessive clause?

A. The concessive clause, a type of subordinate clause, contrasts with the main clause.
B. The concessive clause is the sentence which must be introduced by “although”, “though”, or “while”.
C. The concessive clause is a sentence with an emphatic “do”.
D. The concessive clauseis a type of main clause.

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