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【简答题】
图示机构中，滑块以速度v A 沿水平直线导轨向右运动，通过AB及连杆BD带动半径为r的滚轮D在水平面上作无滑动地滚动，AB上的套筒可绕固定轴O转动。在图示位置时，OD线水平， ，AB与水平线成60°角，BD与AB垂直，M为滚轮边缘上一点，求此瞬时M点的速度。
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举一反三
【单选题】Henry felt so hungry that he ordered a double ______ of fish.
A.
piece
B.
part
C.
portion
D.
section
【单选题】The section that follows the introduction section in a research article is the method section, but what follows the introduction section n a review article is often the:
A.
conclusion section
B.
discussion section
C.
references
D.
main body section
【单选题】How many _______ did you _______ last year ? [ ]
A.
operation, perform
B.
operate, perform
C.
operations, perform
D.
operating, perform
【单选题】The section that follows the introduction section in a research article is the method section, but what follows the introduction section in a review article is often the:
A.
main body section
B.
discussion section
C.
conclusion section
D.
references
【多选题】Which of the followin g structures are NOT mentioned in explanation A?
A.
gallbladder
B.
urinary bladder
C.
prostate
D.
ureter
E.
urethra
F.
kindey
G.
penis
【简答题】The Reading Passage has four sections A-D. Choose the most suitable heading for each section from the list of headings below. Write the appropriate numbers i-viii in boxes 28-31 on your answer sheet. ...
【简答题】to implement/fulfill/perform a contract
【简答题】听力原文：Who will perform. on the concert? Who will perform. on the concert? A group of ______.
【单选题】Additional heat extraction from the exhaust gases can be effected by adding an _____ section to the unit in plants.
A.
air cooler
B.
economizer
C.
injector
D.
air blower
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