火焰的颜色与可燃物的含碳量也有关。当燃烧物的含碳量达到()以上，火焰就显光，而且带有

小明家平均每月付电话费都在28元以上，其中月租费15元，已知市内通话不超过3分钟，每次话费0.15元，如果小明家的市内通话时间每次都不超过3分钟，问小明家平均每月通话至少多少次？

短文首字母填空 (共10小题；每小题l分，满分l0分)

根据短文内容及所给首字母提示写出所缺单词，使短文内容完整。

Overhead bridges can be seen in many parts of Singapore. Overhead bridges are in the places where traffic is very heavy and c____小题1:___the road is not safe. These bridges can help people cross roads safely．Overhead bridges are u____小题2:___ in very much the same way as zebra crossings．They are more efficient（效率高的），though l____小题3:____convenient（方便的）because people have to climb up a lot of s____小题4:____. This is inconvenient to the old．When people use an overhead bridge，they do not hold up traffic．But when they cross a busy road using a zebra crossing，traffic is held up．This is w___小题5:__ the government has built many overhead bridges to help people and k __小题6:____ traffic moving at the same time. The government of Singapore has saved a lot of  m____小题7:____ to build these bridges．For their own safety，people should use them i____小题8:__of rushing across the road．Old people may find it a little difficult, but it is much safer than walking across the road with all the moving t_____小题9:__．Overhead bridges are very useful. People, both old and young, should always use them．This will stop accidents from h ___小题10:__．Are there any overhead bridges in your city? 

为提高现金使用效率，做好现金收支管理，可以采取的做法有（）。

A.延长应收账款的时间

B.使用现金浮游量

C.缩短应收账款的时间

D.推迟应付款的支付

E.企业要尽量使其现金流入和现金流出发生的时间趋于一致

如果BCWS=1000，BCWP=1200，ACWP=1300，那么项目是（）

A.进度超前和在预算之内

B.进度超前和预算超支

C.进度落后和预算超支

D.进度落后和在预算之内

农业机械安全隐患排查应当怎样处置？