问题
判断题
可控硅除用于整流电路外,还用于调压、变频、逆变等方面。
答案
参考答案:对
可控硅除用于整流电路外,还用于调压、变频、逆变等方面。
参考答案:对
阅读短文,从每题所给选项中选出可以填入空白处的最佳选项。 | ||||
Do you like to play outside? Do you like to __1__? Do you like to play with a ball? You can do all these __2__ if you play football. Football players __3__ throw (扔) and catch the ball. They cannot touch the ball with their __4__. They can only kick (踢) the ball. If you have __5__ teams, you can play football. There is a goal (球门) for each team. Some goals are big net and other goals are only lines (线条). The players on one team want to kick the ball into the other __6__. When the ball goes into the other's goal, they make one point (得一分). Lots of people play __7__. You can be __8__ or old, tall or short. Football is easy to play. All you need is a ball and a place to play. Then find enough (足够的) __9__ to play. Keep playing football every day, and you will be very __10__. | ||||
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某工程施工各工序组织网络计划见图7—9,各工序工时与费用如表7—5所示。施工合同约定合同工期为270天,工期延误一天罚3000元,提前一天奖励1000元。
表7—5 | ||||
工 序 | 施工组织方案Ⅰ | 施工组织方案Ⅱ | ||
工时(天) | 费用(元) | 工时(天) | 费用(元) | |
A | 30 | 13000 | 28 | 15000 |
B | 45 | 20000 | 42 | 21000 |
C | 28 | 10000 | 28 | 10000 |
D | 40 | 19000 | 39 | 19500 |
E | 50 | 23000 | 48 | 23500 |
F | 38 | 13000 | 38 | 13000 |
G | 60 | 25000 | 55 | 28000 |
H | 43 | 18000 | 43 | 18000 |
I | 50 | 24000 | 48 | 25000 |
J | 39 | 12800 | 39 | 12800 |
K | 35 | 15000 | 33 | 16000 |
L | 50 | 20000 | 49 | 21000 |
总工期274日 | 212800 | 总工期261日 | 222800 |
[试问]
分析两种施工组织方案下的工期与造价。