成人及1岁以上儿童钙的可耐受最高摄入量定为()mg/d。
A.1000
B.1500
C.1800
D.2000
E.2100
参考答案:D
Not only _____ good about helping other people, but _ to spend time doing what I love to do. [ ]
A. do I feel; get I
B. do I feel; I get
C. I do feel; get I
按网络覆盖范围的大小,我们将计算机网络分为局域网(LAN)、城域网(MAN)、广域网(WAN)和互联网。()