对休克患者监测补液的最佳指标是（） A.血压 B.脉压 C.尿量 D.中

关于世界气温分布规律的叙述，正确的是

A．从沿海向内陆递减

B．从内陆向沿海递减

C．从高纬向低纬递减

D．南半球从北向南递减

血液培养时，血液和培养液的比例应为（）

A.1：4

B.1：3

C.1：10

D.1：15

E.1：20

根据提示用适当的介词完成句子。

1.—Where are my books?

   —They're o________ the sofa.

2.—Where is your pen?

  —It's i________ the pencil case.

3.—Where are my shoes?

  —They're u________ the bed.

4.—Where is my cat?

   —It's b________ the door.

5.—Where is the telephone?

   —It's n________ to the sofa.

6.—Where are the CDs?

   —They're on the desk, b________ the books and the TV.

7. Their bookcase is n________ to the table.

8.—Is there a desk b________ the bed?

   —Yes, there's a desk next to the bed.

高频收发机位于（）

A.电子舱

B.后货舱

C.前设备舱

D.尾锥

遇四级及其以上风力应停止一切吊运作业。