一次元件又称为传感器或发送器,其作用是:感受被测参数的变化,并将被测参数变化转换成为一个相应的信号输出()
参考答案:对
—Hi, guys. Where are you heading now?
—Home. We _______ all our money, so we have to walk home now.[ ]
A. spend
B. spent
C. have spent
D. are spending
()的长时间燃烧可能会发生“沸溢”。
(A)汽油
(B)煤油
(C)柴油
(D)原油