我厂压滤机的滤板的洗涤形式是()
A、明流不可洗
B、暗流不可洗
C、明流可洗
D、暗流可洗
参考答案:A
Take an active part in sports or other activities you enjoy ,________ you can meet various kinds of people.
A.what
B.there
C.which
D.where
如果你生活在20世纪初,你能看到哪些现象?
①电灯亮起来 ②汽车跑起来 ③飞机飞起来 ④去太空旅行[ ]
A、①②③④
B、②③④
C、①②③
D、①②④