搜题请搜索小程序“爱下问搜题”
问题 单项选择题

涡轮流量计安装无误投入使用时，应首先关闭传感器（）阀门，使流体缓慢充满传感器内，然后再打开下游阀门，使流量计投入正常运行。严禁传感器在无流体的状态下受高速流体的冲击，以确保其测量准确度。

A.上游

B.下游

C.中间

D.旁通

答案

参考答案：B

单项选择题

Mr. and Mrs. Smith always spent their holiday in London in the past, staying in a small inn at the foot of a hill. One year, however, Mr. Smith made a lot of money in his business, so they decided to go to New York and stay at a really good hotel while they went touring around that famous city.
They flew to New York and arrived at their hotel late one evening. They expected that they would have to go to bed hungry, because in that small inn in London, no meals were served after seven. They were therefore surprised when the man who received them in the hall asked whether they would take dinner there that night.
"Are you still serving dinner" asked Mr. Smith.
"Yes, certainly, sir," answered the man. "We serve it until haft past nine."
"What are the meals then" asked Mr. Smith.
"Well, sir," answered the man, "We serve breakfast from seven to half past eleven in the morning, lunch from twelve to three in the afternoon, tea from four to five. And dinner from six to half past nine."
"But that hardly leaves any time for us to see the sights of New York," said Mrs. Smith.

They decided to go to a really good hotel because ______ .
[A] it was famous
[B] it was near many interesting places
[C] they now had enough money
查看答案
多项选择题 X型题

治疗量强心苷对心电图的影响是()

A.P-R间期延长

B.S-T段下降呈钓鱼状

C.Q-T间期缩短

D.P-P间期延长

E.T波压低，甚至倒置
查看答案