As it is used in paragraph 4 of the passage, the word porous means______.

As it is used in paragraph 4 of the passage, the word "porous" means______.A.having or full of holesB

查看答案

About 50 years ago the idea of disabled people doing sports was never heard of.

About 50 years ago the idea of disabled people doing sports was never heard of. But when the annual g

查看答案

有源逆变装置是把逆变后的交流能量送回电网。()

有源逆变装置是把逆变后的交流能量送回电网。()

查看答案

正弦波型交-交变频器可以使输出交流电压平均值按正弦规律变化。()

正弦波型交-交变频器可以使输出交流电压平均值按正弦规律变化。()

查看答案

天猫按照商家成交金额的一定比率收取费用,此种收益模式称为:()

天猫按照商家成交金额的一定比率收取费用,此种收益模式称为:()A.推荐费B.销售费C.广告费D.交易费

查看答案