吹扫换热器时,要坚持吹扫一程,另一程(),防止()。如果换热器有付线,应先走付线,管

题型:填空题

问题:

吹扫换热器时,要坚持吹扫一程,另一程(),防止()。如果换热器有付线,应先走付线,管线吹扫()再进入换热器。

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题型:填空题

郑女士,25岁。孕40周,初产,宫口开全2小时,胎头棘下2cm,宫缩较前减弱,胎膜已破,胎心 120次/分,产妇一般情况较好。行胎头吸引术

胎头吸引术应何时解除负压

A.胎头未娩出时

B.胎头娩出后

C.胎头即将娩出时

D.胎身娩出时

E.胎身娩出后

题型:填空题
P(x,y)是曲线
x=2+cosα
y=sinα
(α为参数)上任意一点,则(x-5)2+(y+4)2的最大值为______.
题型:填空题

Every country has its own culture. Even though each country uses doors,doors may have   different functions and purposes 小题1:___________ lead to cultural differences.

When I first came to America,I noticed that

a public building had two different doors and 小题2:___________ had distinct functions. You have to push the door with the word “PUSH” to go out of the building and to pull the door小题3:_________ the word “PULL” to enter  the building. This was new to me, 小题4:_________ we use the same door in South Korea. For quite a few times I failed 小题5:_________ (go )out of a shopping centre and was embarrassed. The way of using school bus doors was also strange to me. I used to take 小题6:__________ school bus to classes.

The school decided that when the driver opened both the front and back doors,students who 小题7:___________off the bus should get off first,and students who were getting on should get on later.

In South Korea, we do not need to wait for people to get 小题8:_________. One morning, I hurried to the bus, and when the bus doors opened, I 小题9:_____________(conscious) tried to get on the school bus through the front door. All the students around looked at me, I was totally embarrassed, and 小题10:___________ face went red. 

题型:填空题

工资指导线包括()。

A.高线

B.预警线

C.低线

D.基准线

E.下线

题型:填空题

在带电作业中,通过传递绳滑车的滑轮,采用()。

A、铁滑轮;

B、铝滑轮;

C、绝缘滑车;

D、都可以。

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