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【单选题】
需要( )作业时,必须由车顶门或规定位置登顶。A.
检修
B.
登顶
C.
施工
D.
清扫
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举一反三
【单选题】在磷掺杂浓度为2×1016cm-3的硅衬底(功函数约为4.25eV)上要做出欧姆接触,下面四种金属最适合的是( )。
A.
In (Wm=3.8eV)
B.
Cr (Wm=4.6eV)
C.
Au (Wm=4.8eV)
D.
Al (Wm=4.2eV)
【单选题】--___________? –I went to the mountains.
A.
Where did you go on vacation?
B.
What are you doing for vacation?
C.
How did you go to the mountains?
D.
How often do you go to the mountains?
【单选题】by beautiful green mountains and situated at the foot of Huangshan Mountain makes Tai Ping Lake a famous tourist attraction. [ ]
A.
Surrounded
B.
Being surrounded
C.
Having been surrounded
D.
Surrounding
【单选题】在磷掺杂浓度为2×1016cm-3的硅衬底（功函数约为4.25eV）上要做出欧姆接触，下面四种金属最适合的是（A在磷掺杂浓度为2×1016cm-3的硅衬底（功函数约为4.25eV）上要做出欧姆接触，下面四种金属最适合的是（A在磷掺杂浓度为2e16 cm-3的硅衬底（功函数约为4.25eV）上要做出欧姆接触，下面四种金属最适合的是（）
A.
In (Wm=3.8eV)
B.
Cr (Wm=4.6eV)
C.
Au (Wm=4.8eV)
D.
Al (Wm=4.3eV)
【单选题】Did the boy have fun __________ to the mountains? [ ]
A.
go
B.
went C. to go D. going
【单选题】Did Daming and his father take photos of the mountains? ______________
A.
Yes, he did
B.
No, he didn’t
C.
No, they did
D.
Yes, they did
【单选题】—Did you go to the beach with your parents last weekend? —No, we ________ went to the mountains instead.
A.
both
B.
all
C.
either
D.
neither
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