下列哪一种情况下,C02最可能成为限制光合作用速率的主要因子()
A. 处于光补偿点
B. 处于光饱和点
C. 处于C0补偿点
D. 处于C0饱和点
查看答案
Combustionknockoccurringinadieselenginecanbecausedby()
A. lowcoolanttemperature
B. insufficientfuel
C. highambienttemperature
D. carbonbuildupontheinjectortips
Thatthescaleofanypartofacharttobelargerthanthescaleofthesurveyis().
A. veryrare
B. common
C. often
D. reasonable
Whichoftheitemslistedcausesadirectactingmechanicalgovernortooperatetheenginefuelcontrollinkage?()
A. Hydraulicoilpressure
B. Servomotoraction
C. Flyweightcentrifugalforce
D. Relaymotion
绘制电气控制线路图时,因接触器线圈属耗能元件,通常画在控制电路的()。
A. 上部
B. 下部
C. 中部
D. 任意位置