给出20个数:87,91,94,88,93,91,89,87,92,86,90,

题型:选择题

问题:

给出20个数:87,91,94,88,93,91,89,87,92,86,90,92,88,90,91,86,89,92,95,88它们的和是(  )

A.1789

B.1799

C.1879

D.1899

考点:简单随机抽样系统抽样分层抽样
题型:选择题
Have you ever planted a few trees on Tree Planting Day? Each year, millions of people, both 41.______, plant a lot of trees. But this may not be the best way to make your home a 42._____ place.
Last week we visited a park in Hebei. We were 43._____ to find most of the trees had been burned. The workers told us that the trees 44._____ soon after they were planted because they weren’t watered well enough. 45._____ workers burned them and cleaned the place for 46._____ trees to be planted this year. 47.______ a card found in one of the dead trees, a student wrote,” I hope this tree will grow up with me to 48.______ the backbone (栋梁) of our country.” The workers said that the survival (存活) of the trees was really more important than 49.______ trees were planted.
Some people in Beijing now have a new idea that they can donate (捐赠) some money and let professional (专业人士) plant and 50.______ the trees.
小题1:
A.students and teachers B.old and young
C.boys and girls D.mother and father
小题2:
A.smallerB.colderC.warmerD.larger
小题3:
A.pleasedB.happyC.interestingD.surprised
小题4:
A.diedB.grewC.boughtD.planted
小题5:
A.ThoughB.WhenC.BecauseD.So
小题6:
A.fewB.oldC.newD.dead
小题7:
A.OverB.FromC.OnD.About
小题8:
A.needB.holdC.plantD.be
小题9:
A.how manyB.whenC.how soonD.why
小题10:
A.take outB.take downC.take upD.take care of
题型:选择题

在水力学中,通常将雷诺数()的流动称为层流,雷诺数()的流动称为湍流。

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消渴病多表现为

A.口渴不欲饮

B.大渴引饮,小便量多

C.口渴喜冷饮

D.口渴喜热饮

E.口渴漱水不欲咽

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患者男性,60岁。反复发作情绪低落,想自杀6年,本次患者在家中用煤气自杀未遂入院。有高血压病史。此患者不宜使用下列哪种抗抑郁药()

A.帕罗西汀

B.舍曲林

C.文拉法辛

D.米氮平

E.西酞普兰

题型:选择题

锅水碱度合格,PH值总在合格范围之内。()注:反之,PH值合格,锅水碱度并不一定合格。

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