下列 Visual Basic 程序段运行后,变量 x 的值为 ______ 。 n=0 For x=3 to 11 step 2 n=n+1 Next x
A.
5
B.
7
C.
11
D.
13
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【单选题】When skeletal muscle is dilated, the calcium pump to recover calcium ions from cytoplasm is mainly distributed on which of the following membrane structures. ( )