【名词&注释】
细胞壁(cell wall)、角质层(cuticle)、胞间层(middle lamella)、初生壁(primary wall)
[单选题]细胞最外一层细胞壁是()
A. 初生壁(primary wall)
B. 次生壁
C. 角质层
D. 胞间层
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学习资料:
[单选题]When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as ()
A. the amount of lube oil additives increase
B. piston speeds increase
C. injection pressure decrease
D. engine speeds decrease
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