A: the weight of its tow，its being anchored，or grounded
B: the weight of its towing hawser on the bottom
C: an adverse current
D: lack of power or an engine breakdow
举一反三
- When an object(物体) is being pushed or pulled horizontally, the normal force(法向力) N holding it against the surface it is on is simply its weight mg.
- A firm that shuts down temporarily has to pay A: its variable costs but not its fixed costs. B: its fixed costs but not its variable costs. C: both its variable costs and its fixed costs. D: neither its variable costs nor its fixed costs.
- FCL means the loading reaches its allowable maximum weight or full measurement.
- Its function is to keep the engine running smoothly between power strokes.
- The atomic weight of an atom, or the molecular weight of a molecule, is its mass relative to that of a(n) ________ atom. This is essentially equal to the number of protons plus neutrons that the atom or molecule contains.
内容
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The quality of the fuel oil and lube oil （）， Im afraid. A: has much to do with the operation of the engine and its life B: have much to do with the operation of the engine and its life C: has much doing with the operation of the engine and its life D: have much doing with the operation of the engine and its life
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The resolution of a microscope refers to () A: Its power to increase an object’s apparent size B: its ability show detail clearly C: its series of interchangeable objective lenses D: its power to scan the surface of an object
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To reduce weight, plastic has taken ______ of iron and steel in making boats. A: its place B: place C: the, place D: a place
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The inductor voltage phase lags its current by 90 o, and the capacitor current lags its voltage by 90 o, is this conclusion true? [ ]. A: It's impossible. B: When the capacitance and inductance are nonlinear components. C: When inductance current and voltage, capacitance current and voltage are not related direction. D: Whenever.
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When we enter a query into a search engine, the engine examples its index and provides a listing of best-matching Web pages.