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单项选择题
A.dim str as string
B.dim str as string(256)
C.dim str as string[256]
D.dim str as string*256
单项选择题
A.if 50≤X≤200then y=1000
B.if x<=200andx>=50then y=1000
C.if x<=200orx>=50then y=1000
D.if x>=50,x<=200then y=1000