热管换热器的热管通常由()3部分组成。
A、管壳、氟利昂、工作介质
B、管壳、热管芯、工作介质
C、管壳、热管芯、毛细材料
D、管壳、蒸发段、冷凝段
参考答案:B
下列各项中,不属于作业成本法优点的是()。
A.作业成本法可以获得更准确的产品和产品线成本
B.有助于改进成本控制
C.为战略管理提供信息支持
D.开发和维护费用较低
句型转换。
1. Summer is the hottest season in China. (改为一般疑问句)
_____ _____ the hottest season in China?
2. What was the weather like in your city? (改为同义句)
_____ was the weather in your city?
3. My sister is talking on the phone. (对画线部分提问)
____ your sister _____?
4. She often plays soccer after school. (用now改写句子)
She _____ _____ soccer now.
5. Today is sunny. (对画线部分提问)
_____ _____ the weather today?