[单选] If a diesel engine is smoking excessively under load, the cause could be ()
A . low exhaust back pressure B . early fuel injection in one of the cylinders C . compression pressure in one of the cylinders D . plugged injector hole
贴现登记簿要求年底须统一打印,装订保管。
下列哪些生物没有内质网() 肺炎双球菌。 人未成熟红细胞。 人成熟红细胞。 水绵。
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甲板室为什么要设置伸缩接头?
If a diesel engine is smoking excessively under load, the cause could be ()