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【简答题】
如果n位能够表示2 n 个不同的数，为什么最大的无符号数是2 n -1而不是2 n 。
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【单选题】An element Y has the proton number 18.The next element in the Periodic Table is an element Z.WhiCh statement is correct?
A.
Element Z has one more electron in its outer shell than element Y.
B.
Element Z has one more electron shell than element Y.
C.
Element Z is in the same group of the Periodic Table as element Y.
D.
Element Z is in the same period of the Periodic Table as element Y.
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