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【多选题】
关于六棱柱的三面投影描述正确的是()。A.
顶面和底面为水平面,水平投影反应
B.
正面及侧面的水平投影集聚为一条直线
C.
棱面的前后两个面为正平面,正面投影反应
D.
其他四个棱面的正面投影和侧面投影均为类似形
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【单选题】听力原文：W: How can I go to the Summer Palace? M: Go straight ahead．and you'll see a bus stop there. Q: How does the woman go to the Summer Palace? (17)
A.
By car.
B.
By bus.
C.
By bike.
【简答题】图1所示基本共射放大电路中，已知 Ucc=12V, UBE= O. 7V, Rc = 3kΩ，β=50,rbb' =300Ω, C1和C2足够大。试求: (1)若静态时Uceq=6V ,Rb =? (2)不接负载时Au=? (3)若Rl=3kΩ，Au=?
【单选题】How do you understand metaphorically that Robert Frost enjoys “the straight crookedness of a good walking stick” in his metrical design?
A.
It means that Frost enjoys writing poetry with a tone that is crookedly straight.
B.
It means that Frost enjoys combining poetic meters with his speaking tone of voice in his poetry.
C.
It means that Frost enjoys writing poetry with a tone that is straightly crooked.
D.
It means that Frost enjoys writing poetry with a meter that is of straight crookedness.
【简答题】三极管接成图2-5所示电路，已知在图2-5(a)中，β=50，R b =475kΩ，R c =3kΩ，U CC =+15V。在图2-5(b)中，β=100，R b =260kΩ，R c =2kΩ，R e =500Ω，U CC =+10V。设三极管的U BE =0.7V，求电路的静态工作点。
【简答题】如何评价《天朝田亩制度》？
【简答题】How do straight-A students schedule their time ?
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