问题
单项选择题
充油电力设备在注油后应有足够的静置时间才可进行耐压试验。静置时间如无制造厂规定，额定电压750kV的设备应大于（）
A.48h
B.72h
C.96h
D.120h
答案
参考答案：C
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充油电力设备在注油后应有足够的静置时间才可进行耐压试验。静置时间如无制造厂规定，额定电压750kV的设备应大于（）
A.48h
B.72h
C.96h
D.120h
参考答案：C
Directions: There are 10 blanks in the following passage. For each numbered blank, there are four choices marked A, B, C and D. Choose the best one and mark your answer on the ANSWER SHEET with a single line through the center.
| Our planet is like a bit spaceship. Our atmosphere acts (51) a shield against harmful radiation and space debris. (52) holds the air and people on the spaceship, (53) everything doesn’t float away. Each of us is an astronaut and our spaceship, the earth, provides our food and water. The sun is our energy (54) and without it we would not be able to survive. (55) every spaceship, the earth is a closed system. The only thing we receive from the outside is energy from the sun. Everything else must be used (56) again. We astronauts don’t seem to realize that this spaceship is the (57) one we’ve got. We (58) its resources and waste the energy the plants have stored from the sun. If we (59) our spaceship, we will destroy ourselves as well. Maybe if we look at the universe which surrounds us, we will appreciate our own spaceship more and take (60) care of it. |
A．damage
B．harm
C．destroy
D．mutilate