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【多选题】
当圆所在的平面垂直于投影面时,其投影特性是()。A.
在与其垂直的投影面上投影积聚成为一条直线段
B.
在与其倾斜的投影面上的投影椭圆短轴也是圆上直径的投影
C.
在与其倾斜的投影面上的投影是个圆
D.
在与其倾斜的投影面上的投影椭圆长轴等于圆的直径
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【单选题】Students in China who volunteer to serve in the western region after graduation may get good scholarship.
A.
Y
B.
N
C.
NG
【单选题】Up to now, they _______enough money for students who can’t afford to go to school.
A.
are raising
B.
have been raising
C.
have raised
D.
had raised
【单选题】The WTO cannot live up to its name _____ it does not include a country that is home to one fifth of mankind .
A.
as long as
B.
while
C.
if
D.
even though
【简答题】The WTO cannot live up to its name ______ it does not include a country that is home to one fifth of mankind. A. as long as B. while C. if D. even though
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