If you want a pen, look inside the _____ of the desk.

衡量胎先露下降程度的重要指标是：

If a substance is dissolved in water or heated ， it may （）a gas.

我国药品管理制度将药品分为：

妊娠妇女睡眠时应多取

Paragraphs 2 and 3 explain ________.

Frank almost never received any education,____?

下列对胸痛的表述错误的是

Two lines can form an infinite number of ______.

胎盘剥离的征象不包括