在空井筒的时候,()溢流。 A.不会产生 B.也会产生 C.压井防止

题型:单项选择题

问题:

在空井筒的时候,()溢流。

A.不会产生

B.也会产生

C.压井防止

考点:井控知识考试井控理论知识井控理论知识题库
题型:单项选择题
根据短文内容,选用适当的词填空。
bamboo, climb, animals, wild, thousand, Europe, kilos, water, jungle, snakes
     Look at this animal. It's big. It's black, yellow, golden and orange. It has two big eyes and two big ears. It's a tiger.
It can run fast(快). Some tigers live in the (1)______. They like to eat meat.   They do not eat fruit. They often catch
and eat small (2)______, they usually eat six (3)______ of meat a day.
     Look at that fat animal. It is white and black. It is very cute(惹人喜爱). Its name is panda. The panda has big black
eyes, a short tail and a white fat body.    It can (4)______ the tree.   Some pandas live in (5) ______ grove(林子) and
the other pandas live in the zoo. Pandas like bamboo and grass. They usually eat 15 bamboo a day. They often drink
water. They only live in China. There're about one (6)______ and six hundred pandas in the (7)_______ in China. So
they are very few. We must safeguard(安全保护) them. Let them be our friends.
     There are lots of (8)_______, they can live in Asia,  America,  Africa, Australia and (9)________. They eat meat,
too. It doesn't like (10)_______.
题型:单项选择题

在延时精度要求不高,电源电压波动较大的场合,应选用()。

A、空气阻尼式时间继电器

B、晶体管式时间继电器

C、电动式时间继电器

D、电磁式时间继电器

题型:单项选择题

24岁,G2P0,第24孕周时超声检查提示:胎盘位于子宫前壁下段,部分覆盖宫颈内口,产科检查正常。该病例应诊断为()

A.正常胎盘位置

B.部分性前置胎盘

C.中央性前置胎盘

D.边缘性前置胎盘

E.目前不做前置胎盘诊断

题型:单项选择题

干化学法检测尿酮体,最敏感的是()。

A.乙酰乙酸

B.丙酮

C.β-羟丁酸

D.α-酮戊二酸

E.乙酰CoA

题型:单项选择题

遗传漂变(genetic drift)

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