发动机不易起火,转速不易提高,()化油器有时“回火”()易熄火可判为混合气过稀。
A.功率下降
B.行驶乏力
C.怠速不稳
D.温度过高
参考答案:A, B, C
Without Sir Tim, the father of the WWW, keeping up with the latest ________ so convenient. [ ]
A. would be
B. wouldn't be
C. would have been
D. wouldn't have been
采用带减振装置的镗刀杆镗削小直径深孔,可以避免产生振动和提高表面精度。