护筒平面位置的偏差应不大于( )。
A.5cm
B.4cm
C.7cm
D.6cm
参考答案:A
解析:埋置护筒要考虑桩位的地质和水文情况,其平面位置的偏差不应超5cm。
At the dinner, Mr. Blank was in his cups when he made his speech and ______ it was the most amusing
speech of the evening. [ ]
A. suddenly
B. consequently
C. usually
D. immediately
下列反应中,既属于氧化还原反应,又是吸热反应的是[ ]
A.Ba(OH)2·8H2O与NH4Cl反应
B.铝与稀盐酸
C.灼热的碳与二氧化碳反应
D.甲烷与氧气的燃烧反应