三等水准测量某一测站后视黑面读数为1.731m，那么后视红面读数为

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问题单项选择题

三等水准测量某一测站后视黑面读数为1.731m，那么后视红面读数为（）m，可认为观测合格。

A.6.419

B.l.732

C.6.731

D.4.788

答案

参考答案：A

解答题

已知四个数，前三个数成等比数列，和为19，后三个数成等差数列，和为12，求此四个数．

问答题

1. When does Mike usually get up? ____________________________________
2. When does he go to school? ____________________________________
3. When does he have lunch? ____________________________________
4. What does he do at seven o'clock? ____________________________________
5. What does he do at ten fifteen? ____________________________________