皮皮学，免费搜题
登录
搜题
【简答题】
酸雨是大气中的 和 在强光照射下,进行光化学氧化作用,并和水汽结合而形成的。
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】When there was a short________in the conversation, I asked if anyone would like anything to drink.
A.
blank
B.
space
C.
pause
D.
wait
【单选题】As I ___________ to say good-bye, I asked Billy if there was anything else I could do for him.
A.
stepped back
B.
held back
C.
stepped down
D.
stood for
【简答题】I asked him not (say) ______anything about the plan we made last week.
【单选题】What are the three principle planes in orthographic projection?
A.
front, top, profile
B.
back, top, profile
C.
top, front, right side
D.
frontal, horizontal, profile
【单选题】—Where’s Cathy?—______Anything wrong?—I asked her to do something, but she wouldn’t.—To wash her hair before supper.
A.
She is upstairs in her room. What for?
B.
She is ill. What did you tell her to do?
C.
She is upstairs in her room. What did you tell her to do?
D.
She has gone to see a doctor. What is she going to do?
【单选题】In orthographic projection, visual rays are __________ to the projection plane.
A.
parallel
B.
adjacent
C.
perpendicular
D.
tangent
【简答题】I asked her not______(tell)others anything about our research until the end of the week．
【单选题】"Anything?" I asked, looking at him narrowly .
A.
passionately
B.
closely
C.
rationally
D.
scornfully
相关题目：