真空脱氧的优点()。
A、污染钢液
B、不去除夹杂
C、净化钢液
D、速度慢
参考答案:C
At the United Nations Climate Change Conference, the UN Secretary General points out that, ______, the climate situation will get worse and worse.
A.if not dealing with properly
B.unless dealing with properly
C.if properly dealt with
D.unless properly dealt with
国家在征税前就以法律或法规的形式预先规定了征税的标准,这体现了税收的( )特征。
A.强制性B.无偿性C.标准性D.固定性