下列不属于旧机电产品的是 ( )
A.旧钢轨
B.旧打印机
C.旧电饭锅
D.旧车船
参考答案:A
Never before _____seen anybody who can play tennis as well as Robert.
A.had she
B.she had
C.has she
D.she has
矿工被困井下,下列物质中对其维持生命很重要,但又不能提供能量的是( )
A.水
B.糖类
C.脂肪
D.蛋白质