单项选择题The resistance to the movement of the globule in oily water mixture depends on its size and the () of the fluid.

A.pressure
B.velocity
C.gravity
D.viscosity


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5.单项选择题In general, domestic flesh water tank kept under pressure by an external supply of ().

A.forced circulating pump
B.compressed air
C.gravity tank
D.bead tank

6.单项选择题The abbreviation "TDS" about the potable water probably means ().

A.total dissolved solids
B.temperature of distillation of sea water
C.total dissolved sodium
D.total delivery system

8.单项选择题In more recent years, () heat exchangers have frequently been employed for jacket water and oil cooling.

A.shell and tube type
B.plate type
C.coil type
D.conical disc type

10.单项选择题A non-return valve in the air delivery line near to the compressor must be ()type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity

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