皮皮学，免费搜题
登录
搜题
【简答题】
为什么车床用丝杆和光杆分别担任车螺纹和车削进给的传动?如果只用其中的一个既车螺纹又传动进给，会产生什么问题?
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Hardly() the classroom when the class began.
A.
he had entered()
B.
he entered
C.
had he entered()
D.
he was entered
【单选题】— Do you think the thief entered through the garage door? — No. If he had. I don't believe he _____ the living room window. [ ]
A.
would have broken
B.
had broken
C.
would break
D.
broke
【单选题】—Do you think the thief entered through the window? —No, if he had, I don’t believe, _______ broken the living-room’s window.
A.
he would have
B.
he must have
C.
he had
D.
should he have
【单选题】I would have enjoyed myself more _______i gone with a group of friends.
A.
had
B.
if
C.
has
D.
shall
【单选题】______ in his book, he didn’t notice me when I entered the room.
A.
Devoted
B.
Absorbed
C.
Absorbing
D.
Devoting
【简答题】Now that my sons are more (depend), I have more time for myself.
【单选题】________ in his book, he didn't notice me ________ I entered the room.
A.
Devoted; when
B.
Absorbed; while
C.
Absorbed; when
D.
Devoted; while
【单选题】was Sam aware that he was in danger.
A.
When he entered the forest
B.
After he had entered the forest
C.
Only after entering the forest
D.
Upon entering the forest
【单选题】Robin ________ volleyball quite well, but he hasn’t played it since he entered senior high school.
A.
is playing
B.
had played
C.
used to play
D.
plays
【单选题】—Do you think the thief entered through the back door? —No, if he had, I don’t believe he ______ the living-room window.
A.
would break
B.
broke
C.
would have broken
D.
had broken
相关题目：