正四面体ABCD的棱长为1,E在BC上,F在AD上,BE=2EC,DF=2FA,

题型:填空题

问题:

正四面体ABCD的棱长为1,E在BC上,F在AD上,BE=2EC,DF=2FA,则EF的

长度是_________。

考点:柱、锥、台、球的结构特征
题型:填空题

某班有10人参加田径运动会,有12人参加排球比赛,两次比赛都参加的有4人,则这两次运动会该班共有(    )人参赛.

题型:填空题

指出下面有关熔和法制备软膏剂的错误说法

A.熔和法只适用于含固体成分的基质

B.制备过程为先加热熔化,再加入其他成分熔合成均匀基质,然后加入药物,能溶者搅拌均匀冷却即可

C.对于药物不溶于基质者,应先将药研成细粉筛入熔化或软化的基质中,搅拌均匀即可

D.若药粉不够细腻,则需用三滚筒软膏机进一步研磨至无颗粒感

E.油溶性基质大量制备时常用熔和法

题型:填空题

根据句意和提示写出单词,完成句子。

小题1:________(八月) is the hottest month of a year.

小题2:You don’t look________(好) today. What’s up?

小题3:Don’t________(看书) in bed, for it’s bad for your eyes.

小题4:It is not safe for such a small child to swim _______ (单独) in the river.

小题5:The more careful you are, the__________(少) mistakes you’ll make in this exam.

小题6:I like watching the moonlight shine________(穿过) the window peacefully.

小题7:The man bought some gas(汽油) for his car and it _______(花)him 200 yuan.

小题8:The _______ (三十) Olympic Games will be held in London in 2012. I can’t simply wait for it.

小题9:I don’t think the sweater belong to______(he).

小题10:---I passed the last exam yesterday.   

---Oh, you’re really a _______ (luck) dog.

小题11:Lily is the ________(bad) of the girls at Maths.

小题12:We’ll have a three_________(day) holiday on Tomb Sweeping Day.

小题13:Nobody studies as   ▲ (happy) as Simon. He really enjoys studying.

小题14:Unlike us Chinese people, people in the west eat with   ▲  (knife) and forks.

小题15:–Are you going back home this summer holiday?

--Yes, I have been away for 4 years. How I look forward to   ▲  (see) my family again!

题型:填空题

下列不是蛋白质α-螺旋结构特点的是( )。

A.天然蛋白质多为右手螺旋

B.肽链平面充分伸展

C.每隔3.6个氨基酸螺旋上升一圈

D.每个氨基酸残基上升高度为0.15nm

E.每个氨基酸残基围绕螺旋中心轴旋转100°

题型:填空题

下列各项不属于商品运输功能的是( )。

A.商品转移功能
B.商品交易功能
C.商品储存功能
D.商品增值功能

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