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【单选题】
下列方程中所示曲面是旋转曲面的是( ).A.
X 2 +y 2 +z 2 =1
B.
X 2 -y 2 /4+z 2 =1
C.
X 2 +y 2 =4z
D.
X 2 +y 2 /9-z 2 /16=-1
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举一反三
【单选题】According to the passage, 'to move as much of these goods as possible' (Lines 4～5, Para. 1 ) means______.
A.
to sell the largest possible amount of goods
B.
to transport goods as efficiently as possible
C.
to dispose of these goods in large quantities
D.
to redesign these goods for large-scale production
【简答题】Who can enter the competitions.
【单选题】According to Paragraph 8, which of the following is NOT true of climbing competitions in the late 20th century?
A.
There are various standards to judge climbing competitions.
B.
Climbing competitions are attractive to various kinds of climbers.
C.
Only very skilled climbers can participate in climbing competitions
D.
Climbing competitions have won the support of many associations.
【简答题】In competitions only women perform. on the
【多选题】At noon, what kind of competitions on the ship does the people sign for?
A.
rhythmic exercises
B.
aerobic exercises
C.
golf competitions
D.
table tennis competitions
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