可用于溶蚀性骨架片的材料为 A．羟丙甲纤维素 B．卡波姆 C．聚乙烯 D．蜡类 E．

When assessing the fetal heart rate tracing, the nurse becomes concerned about the fetal heart rate pattern. In response to the loss of variability, the nurse repositions the client to her left side and administers oxygen. These actions are likely to improve which of the following（）

A. Fetal hypoxia.

B. The contraction pattern.

C. The status of a trapped cord.

D. Maternal comfort.

根据中文及首字母提示完成下列对话。

Chen Jie: I have a new classmate.

Mike: B___________ (男孩) or ___________ (女孩)?

Chen Jie: A girl.

Mike: Who's she?

Chen Jie: She's Amy. She's a ___________ (学生). She's my good ___________ (朋友).

             She likes computer games.

如果将点P（m+2，2m+4）向右平移1个单位长度到点Q，且点Q在y轴上，则点Q的坐标是（    ）。

简述运输规模经济的基本原理。

选用超声耦合剂错误的是（）

A.耦合剂越厚越好

B.应满足阻抗匹配条件

C.排除空气，增加透声性

D.让超声尽量多进入人体

E.特性阻抗接近人体（软组织）的特性阻抗