线路上钢轨硬弯应及时整正，用于60kg/m钢轨的调直机为YZ-2型，它是YZ-1型的改进。
参考答案：对
One of the judges __________ to Gana’s film festival was a famous artist from China, Zhang Ziyi.
A．invited
B．to invite
C．had been invited
D．being invited
了解胎儿宫内生长发育的情况可根据（）
A.每天早晚自测胎动
B.宫高、腹围及胎头双顶径测定
C.羊水L／S测定
D.NST或OCT
E.羊膜镜检查
