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【单选题】
圆柱被平面截切后产生的截交线形状有____。A.
矩形、椭圆
B.
矩形、圆、椭圆
C.
圆、椭圆、拋物线
D.
圆、椭圆、双曲线
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】If the president wants to put a treaty into effect, he has to get the approval by two thirds of the _____.
A.
Senate
B.
Cabinet
C.
Congress
D.
The Supreme Court
【单选题】If the president wants to put a treaty into effect, he has to get the approval by two thirds of the （）
A.
Senate
B.
Cabinet
C.
Congress
【单选题】有关动脉血压,正确的是
A.
平均动脉压=(舒张压+收缩压)÷2
B.
正常青年人安静时收缩压在100~120mmHg
C.
舒张压高低主要反映每搏输出量多少
D.
收缩压主要反映外周阻力的大小
E.
动脉血压仅是由于心脏射血形成的
【单选题】4) The president wants to see their national flag _______ on the surface of Mars by 2019.
A.
to fly
B.
flying
C.
flew
D.
flown
【单选题】The president wants to see their national flag ______ on the surface of Mars by 2019.
A.
to fly
B.
flying
C.
flew
D.
flown
【简答题】The president wants to explore every towards peace in the region. (way)
【单选题】The president wants to improve the nation's highways and mass ____________ systems.
A.
transit
B.
operation
C.
transition
D.
transmission
【判断题】If the president wants to put a treaty into effect, he has to get the approval by two thirds of the senate.
A.
正确
B.
错误
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