球员只要在极阵內拾球即可压球触地。
参考答案：错
I don't think the Internet will ever____books and newspapers. [ ]
A. take place
B. take the place of
C. take their place
D. take place of
ZigBee堆栈是在（）标准基础上建立的。
A、IEEE802.15.4
B、IEEE802.11.4
C、IEEE802.12.4
D、IEEE802.13.4
