皮皮学，免费搜题
登录
搜题
【单选题】
The professor walked onto the platform and seated himself in a chair, for answering questions. [ ]A.
had prepared
B.
being prepared
C.
was preparing
D.
prepared
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】已知蜗轮蜗杆转动,蜗杆头数Z1=2,蜗杆分度圆直径d1=40mm,蜗轮齿数Z2=59,蜗轮分度圆直径d2=236mm,则蜗杆传动比I= ()
A.
236/40
B.
40/236
C.
59/2
D.
2/59
【简答题】词性转化：根据提示写出相应单词。 1. 不利条件；不便之处n.______ 有利条件；优势n.______ 2. 毕业vi.______ 毕业生n. ______ 毕业n.______ 3. 组织；成立vt.______ 有组织的adj.______ 组织；机构n.______ 4. 决定；确定；下定决心vt.______ 坚决的；有决心的a...
【多选题】What does a room attendant say when she receives the complaint from the guest that his luggage hasn’t arrived?
A.
I am sorry to hear that, I am sure the bellman will send it up to you soon.
B.
I am sorry for bringing you the inconvenience. I will ask about the bellman immediately.
C.
Could you just wait? We are all busy today.
D.
I don’t know who is the one sending you
【简答题】vi. 毕业 n. 毕业生
【单选题】已知蜗杆头数Z1,蜗杆分度圆直径d1,蜗杆直径系数q,模数m,蜗杆螺旋线导程Pz,则蜗杆导程角γ的计算公式是 。
A.
γ=tan-1(Z1 Pz∕d1)
B.
γ=tan-1(Z1m1∕d1)
C.
γ=tan-1(Z1 m1∕πd1)
D.
γ=tan-1(q∕Z1)
【简答题】试推导如下图所示电网络系统的传递函数 U 2 ( s ) /U 1 ( s )
【简答题】vi. 毕业 n. 大学毕业生
相关题目：
参考解析：
知识点：
题目纠错 0
发布
