问题
单项选择题
溴化锂吸收式制冷机组的冷却水中还有溴化锂溶液,其可能的原因是()。
A、发生器中液位太低
B、发生器中液位太高
C、冷却水温度太低
答案
参考答案:B
溴化锂吸收式制冷机组的冷却水中还有溴化锂溶液,其可能的原因是()。
A、发生器中液位太低
B、发生器中液位太高
C、冷却水温度太低
参考答案:B
阅读理解。 | ||||
Here are two letters to George and his replies. | ||||
| ||||
1. Alice is worrying about ___. | ||||
A. her friends B. her marks C. her height D. her weight | ||||
2. Bob should ___ according to george's letter. | ||||
A. take more exercise B. talk to his friends C. join a basketball team D. leam some French | ||||
3. Ceorge advises Alice to talk to___ for help. | ||||
A. her mother B. her teacher C. Bob's teacher D. Bob's friends |