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【单选题】
Scholars from the University of Kansas published the results of a decade_long Study recently,suggesting that sending, children to pre-school at the age of 4 comes too late to_educational drawbacks at home.
A.
ACCOUNT FOR
B.
preference for C .compensate for D. allow for
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举一反三
【单选题】According to this news item, experts are concerned about the following aspects EXCEPT ______.
A.
population growth.
B.
food resources.
C.
water pollution.
D.
water resources.
【单选题】提速道岔护轨顶面高出基本轨( )。
A.
10mm
B.
12mm
C.
15mm
D.
16mm
【单选题】两端铰支的压杆,其长度系数为( )
A.
0.5
B.
0.7
C.
1
D.
2
【单选题】用欧拉公式计算细长压杆的临界压力时,当压杆的支承条件为两端铰支时,其长度系数μ的取值等于
A.
0.5
B.
0.7
C.
1
D.
2
【单选题】散剂加入溶剂后,产生气泡后迅速溶解,该散剂为
A.
腾散剂
B.
共熔物散剂
C.
液体散剂
D.
分剂量散剂
【单选题】如图所示为一个半圆柱状的透明玻璃,AB线段为其横截面半圆形的直径,O点为半圆的圆心。若有一条光线CO自空气中射入此玻璃柱,入射点为O点。则下列光的折射路径正确的是 [     ]
A.
B.
C.
【单选题】两端铰支(其中一端轴向可动)压杆的长度系数μ为:
A.
0.5
B.
0.7
C.
2
D.
1
【简答题】Health experts are calling for action to increase cancer care and control in the developing world. A medical research paper says cancer was once thought of as a problem mostly in the developed world. ...
【简答题】如图所示,以圆柱的下底面为底面,并以圆柱的上底面圆心为顶点作圆锥,则该圆锥与圆柱等底等高。若圆锥的轴截面是一个正三角形,则圆柱的侧面积与圆锥的侧面积之比为
【单选题】散剂加入溶剂后,产生气泡后迅速溶解,该散剂为
A.
泡腾散剂
B.
含共熔物散剂
C.
含液体散剂
D.
分剂量散剂
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