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The usual symptoms of cavitation in a centrifugal pump is _____.A.noise and vibrationB.an
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In the north part of black bears range, most of them are______.A．grey and whiteB．red and b
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The clear[l]and dark[l]are the______of the phoneme ／l／.A．phonesB．allophonesC．phonemesD．mor
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______ are afraid of difficulties, and we are all determined.A．None of usB．Not all of usC．
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Stress is a natural part of everyday life and there is no way you can avoid it, ______you
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Most of the stones are____________ a man and weig
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Radio television and press ________ of conveying news and information.A) are the m
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