If a diesel engines exhaust temperature is abnormally high, the cause could be()
A. too light of a load
B. injection timing is too early
C. overloading of the engine
D. too low of a compression ratio
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2011年,市区的城镇化率比全国、全省平均水平分别低()个百分点和0.1个百分点。
A. 5.5
B. 10.8
C. 6.7
使用刚性压轮对沥青混凝土铺砌层进行碾压时,会使铺砌表层产生()次松弛现象。
A. 1
B. 2
C. 3
D. 4