一、二等水准路线跨越江、河,当视线长度大于()M时,应根据视线长度和仪器设备等情况,选用规范的相应方法进行跨河水准测量。
A.50
B.100
C.150
D.200
参考答案:C
根据情景补全对话。
A: 1 you 2 to 3 to the cinema?
B: That's a great 4 ! 5 go 6 Lingling. 7 is it?
A: It's 8 the afternoon and 9 the evening.
B: 10 go in the evening. 11 you 12 to 13 to a football 14 on Sunday? It's Manchester
United, my 15 team.
A: That's a good 16 .
将下列各组物质同时放到适量的水中,只能得到无色透明溶液的是( )
A.Na2CO3、NaCl、Na2SO4
B.HCl、AgNO3、K2SO4
C.KCl、HCl、CuSO4
D.NaCl、KOH、FeCl3