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【单选题】
下列______可作为流体流动流向判据。A.
流体从位能高处向位能低处流动
B.
流体从动能高处向动能低处流动
C.
流体从总势能高处向总势能低处流动
D.
流体从压强高处向压强低处流动
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举一反三
【单选题】— Has Tom finished writing his essay today? — I have no idea. He ______ it this morning.
A.
wrote
B.
has written
C.
was writing
D.
had written
【单选题】The man who wrote this essay was _____.
A.
a Brazilian traveler in a part of his country he had never been to before
B.
a Brazilian from Rio who had received his education in England
C.
an American from New England traveling in Brazil
D.
a Latin American driving through the mountainous area of Brazil
【单选题】(亚马逊)(单选)关于亚马逊专业卖家月租费,以下说法错误的是? ()
A.
北美站:39.99 美金
B.
欧洲站:45 英镑
C.
日本站:4900 日元
D.
澳洲站:49.95 澳元
【单选题】—Has he finished his essay? —I don't know. He______it this morning.
A.
has written
B.
was writing
C.
wrote
D.
had written
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