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【单选题】
根据物质循环的范围不同，生物地球化学循环可分为（? ? ）[1分]A.
生物小循环型循环
B.
生物小循环和地质大循环
C.
气相型和沉积型循环
D.
气相型循环和地质大循环
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举一反三
【单选题】Sludge may form in the crankcase of an air conditioning compressor as a result of ______.
A.
bubbling refrigerant
B.
overheating and oxidation
C.
lowered operating temperatures
D.
reducing the cloud or floc point
【单选题】Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of （）
A.
refrigerant bubbles in the lube oil
B.
refrigerant reducing the lube oil viscosity
C.
oxidation of the lube oil from overheating
D.
reducing the floc or cloud point of the oil
【单选题】The lengthening of a crack formed in the shell plating of a ship may be prevented by _____.
A.
welding brackets across both ends of the crack
B.
chipping out and slot welding the entire crack
C.
drilling a hole at each end of the crack
D.
cutting a square notch at each end of the crack
【单选题】Which harmful consequence may be the result of lube oil sludge accumulation? .
A.
Clogged oil pump suction screens
B.
Increased oil operating temperatures
C.
Sticking piston rings
D.
All of the above
【单选题】In both FPP and MMP systems government may not be formed based on a majority voter mandate.
A.
真
B.
假
C.
NOT GIVEN
【单选题】Sludge may form. in the lubricating oil crankcase of a reciprocating air conditioning compressor as a result of ______.
A.
wax precipitation in the lube oil
B.
contamination by dust, scale, or moisture
C.
refrigerant bubbles in the lube oil
D.
refrigerant reducing the lube oil viscosity
【单选题】Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of_____.
A.
refrigerant bubbles in the Iube oil
B.
refrigerant reducing the lube oil viscosity
C.
oxidation of the lube oil from overheating
D.
reducing the floc or cloud point of the oil
【单选题】Sludge may be formed in the oil in the crankcase of a reciprocating air conditioning compressor as a result of ______.
A.
refrigerant bubbles in the lube oil
B.
refrigerant reducing the lube oil viscosity
C.
oxidation(氧化) of the lube oil from overheating
D.
reducing the floc or cloud point of the oil
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