变换催化剂活性降低以后可以通过适当提高()的办法,提高其活性。
参考答案:入口温度
In China today women ___ 40% of the workforce, and nearly half of the others with children are in paid work.
A.build up
B.hold on
C.make up
D.stand for
目前广泛应用的人类生育控制技术不包括()
A.避孕
B.人工流产
C.绝育
D.产前优生学诊断
E.克隆