债券发行价格与债券面额的关系为（）。 A.平价=债券面额，折价>债券面额，溢价 B.

用所给词适当形式填空：

1. The men in _______ (制服) came up to them

2. When you come to the ________ (拐角), turn right.

3. He ran ________ (朝，向) the car that was moving.

4. Are you ________ (惊讶的) to see the animals?

5. My mother was ill yesterday and she felt very ________ (虚弱的).

6. Can you swim ________ (cross) the river.

7. The problem is very easy. They can work it out ________ (easy).

8. He went to school without ________ (have) breakfast.

9. They ________ (plan) to take another route when they saw the robbers.

10. We'll learn the ________ (twelve) lesson tomorrow.

门诊治疗时放射性活度应小于（）

A.5mCi

B.10mCi

C.20mCi

D.25mCi

E.30mCi

淬火、低温回火以后的钢。常用布氏硬度试验方法测定其硬度。（）

煤气干法脱硫装置按构造可分为（）和（）两种。

线间距决定于哪些因素？