螺纹锁紧环高压换热器信号孔的作用是（）。A、检查螺纹锁紧环高_爱下问搜题

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问题单项选择题

螺纹锁紧环高压换热器信号孔的作用是（）。

A、检查螺纹锁紧环高压换热器在运转中发生外密封圈向外泄漏

B、检查螺纹锁紧环高压换热器在运转中发生管程和壳程间泄漏

C、检查密封圈的变形

D、内漏、外漏均可检查

答案

参考答案：A

填空题

happy, yourself, business, progress, color, begin, visit, able, twice

1. —How long has the nationwide ban (禁止) on plastic bags been put into practice?
    —At the _____ of June.
2. —I'll fly to Shanghai on _____ next Friday.
    —Have a good trip.
3. —Mum, I'm sorry I failed my English test again, though I tried my best.
    —Oh, believe in _____ and you'll make _____ at last.
4. —They are discussing what to do for the _____.
    —It is necessary to provide them with more positions.
5. There are a lot of _____ flowers on both sides of the streets.
6. Listen! They are singing _____ in the classroom.
7. Tom, take the medicine ____ a day after meals for a week.
8. More and more foreign ____ are interested in Panzhihua.

填空题

中药的“四气”是指药物的（）四种药性。