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【判断题】
当块嵌套在另一个块中时,内部块中定义的变量可能与外部块中定义的变量具有相同的名称。虽然一般认为这样做不妥,因为它很可能会导致混乱,但其实这样做是被允许的。当内部块中的变量进入作用域时,外部块中的变量变为“隐藏”,不能使用。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】From the passage, you can tell that people prefer glass fiber cables to copper cables because ______.
A.
glass fiber is less expensive
B.
glass fiber delivers messages directly
C.
glass fiber is more up to date
D.
glass fiber is easier to make
【单选题】Glass-fiber cables can carry hundreds of telephone conversations ______.
A.
spontaneously
B.
simultaneously
C.
immediately
D.
immiscibly
【单选题】Glass-fiber cables can carry hundreds of telephone conversations ______ .
A.
at length
B.
at the moment
C.
at the same time
D.
at intervals
【简答题】说明发生致癌作用的主要过程,以及加速或减缓这些过程的种因素。说明三种直接或间接证明致癌作用的测试方法。
【单选题】Glass-fiber cables can carry hundreds of telephone conversations simultaneously .
A.
at the same time
B.
without distortion
C.
with safety
D.
in little space
【单选题】________ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
A.
Twisted-pair
B.
Coaxial
C.
None of these
D.
Fiber-optic
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