单项选择题维管形成层主要通过()扩大形成层环。
A.平周分裂
B.横向分裂
C.垂周分裂
D.以上三种均可
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1.单项选择题透平与往复压缩系统中,往复压缩机由驱动的()。
A.空气
B.蒸汽透平
C.电动机
D.混合方式
2.单项选择题下列关于执行器的说法中不恰当的是()。
A.执行器按使用能源不同分为气动执行器和电动执行器
B.气动执行器结构简单,动作可靠,适用于防火防爆场合
C.电动执行器动作迅速,其信号便于远传
D.执行器的开度与流量总是呈线性关系
10.判断题天然尖晶石与合成尖晶石内部都可能见到串珠状包体。
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