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【简答题】
IPV4地址常分为 、 、 、 、 等5类
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举一反三
【单选题】如图所示，两块平面镜相交，一束光线沿AO斜射到平面镜MP上，并且与平面镜的夹角为30°，光线经两平面镜反射后与AO重合，但方向相反，则两块平面镜的夹角α是（ ）
A.
30°
B.
45°
C.
60°
D.
70°
【单选题】F: Diego, have we received a fax from Chris at Complex Computers yet?M: We did, but it came through blurry. I called, and Chris said they were having problems with the fax machine. They’re trying to f...
A.
Ask Chris to scan the contract
B.
Ask Chris to call technical support
C.
Ask Chris to copy the contract
D.
Ask Chris to deliver the document by mail
【单选题】Read the passage and choose the best answer. Recently I attended several meetings where we talked about ways to retain students and keep younger faculty members from going elsewhere. It seems higher e...
A.
They are effectively tackling real or imagined problems.
B.
They often fail to combine teaching with research.
C.
They are over-burdened with administrative staff.
D.
They lack talent to fix their deepening problems.
【单选题】如图，平面α⊥平面β，A∈α，B∈β，AB与两平面α、β所成的角分别为 和 ，过A、B分别作两平面交线的垂线，垂足为A′、B′，则AB：A′B′= [ ] A、2：1
B.
3：1
C.
3：2
D.
4：3
【单选题】F: Diego, have we received a fax from Chris at Complex Computers yet?M: We did, but it came through blurry. I called, and Chris said they were having problems with the fax machine. They’re trying to f...
A.
The shipment delay
B.
The quality of the fax machines
C.
The service contract for Office PCs
D.
The shipment delay
【单选题】F: Diego, have we received a fax from Chris at Complex Computers yet?M: We did, but it came through blurry. I called, and Chris said they were having problems with the fax machine. They’re trying to f...
A.
The Blurry Company
B.
The Complex Computers
C.
The Ramon Brothers
D.
Not mentioned
【简答题】如图，平面α⊥平面β，A∈α，B∈β，AB与两平面α、β所成的角分别为 和 ，过A、B分别作两平面交线的垂线，垂足为A′、B′，则AB：A′B′=（ ）。
【单选题】The new principal promised to _____ the school's problems. We need more teachers and new books.
A.
perform
B.
record
C.
fix
D.
hold
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