下列常用的桩锤中，宜用于砂土、塑性黏土及松软砂黏土的是( )。
A．单动气锤B．双动气锤C．振动桩锤D．柴油桩锤
参考答案：D
存入银行100元钱，整存整取一年，若年利率是2.79%，一年后可得到利息2.79元。[ ]
I in Microsoft Company for many years, but I have never regretted my final decisin to switch to
Apple Company.[ ]
A. had worked
B. have worked
C. have been working
D. worked
