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【单选题】
具有双层单位膜的细胞器是( )A.
溶酶体
B.
过氧化物酶体
C.
高尔基体
D.
线粒体
E.
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反馈参考答案：
举一反三
【单选题】对于 下面 类定义的叙述中正确的是 ( ) 。 class A { public: virtual void func1( ) { } void func2( ) { } }; class B: public A { public : void func1( ) { cout< virtual void func2( ) { cout< };
A.
A::func2() 和 B::func1() 都是虚函数
B.
A::func2() 和 B::func1() 都不是虚函数
C.
B::func1() 是虚函数，而 A::func2() 不是虚函数
D.
B ::func1() 不是虚函数，而 A::func2() 是虚函数
【单选题】In comparison with the adult American population today, the Americans of the 1910s ____.
A.
ate more food and had more physical activities
B.
ate less food but had more activities
C.
ate less food and had less physical exercise
D.
had more weight problems
【单选题】对于下面定义的叙述中,正确的是 。 struct ex {int x;float y;char z;}exsample;
A.
struct ex 是结构体类型
B.
x,y,z 是 3 个变量名
C.
struct 是结构体类型
D.
exsample 是结构体类型名
【单选题】In comparison with the adult American Population today, the Americans of the 1910s ______.
A.
ate more food and had more physical activities
B.
ate less food but had more activities
C.
ate less food and had less physical exercise
D.
had more weight problems
【单选题】Today the American doctor is one of the foremost heart-transplant surgeons in the world, ______tens of such operations each year.
A.
to perform
B.
performing
C.
to performing
D.
perform
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