For the subway is an enduring _________ of mass-transit engineering: tains make 6,800 trips each day over 731 miles of rail, carrying 3.7 million people.
A.
marble
B.
marvel
C.
wonderful
D.
marvelous
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参考答案:
举一反三
【单选题】以下自发反应可用焓判据来解释的是( )
A.
硝酸铵自发溶于水
B.
2N 2 O(g)===4NO 2 (g) + O 2 (g)△H=+56.7kJ/mol
C.
(NH 4 ) 2 CO 3 (s)===NH 4 HCO 3 (s) + NH 3 (g)△H=+74.9kJ/mol
【单选题】The component of the healthy personality that is the first to develop is the sense of trust. As with other personality components, the sense of trust is not something that develops independent of othe...
A.
the infant experiences some satisfaction
B.
adults' trust is adequate
C.
the infant learns how to move
D.
the infant is surrounded by people he can recognize