小儿体重增长的正常波动范围是()
A.50%左右
B.40%左右
C.30%左右
D.20%左右
E.10%左右
参考答案:E
环保疏浚挖泥厚度一般为()。
A.1m以上
B.1m以内
C.大于1m小于2m
D.不确定
—Can I help you, sir?
—Yes, I brought this radio here yesterday, but it______ now.[ ]
A. didn't work
B. won't work
C. couldn't work
D. doesn't work