注汽锅炉的主要受热面是()。
(A)辐射段
(B)对流段
(C)过渡段
(D)给水预热器
参考答案:A
With the release of the latest version of iPhone, users can have easy _________________ to ever-growing incredible on-line games.
A.desire
B.access
C.certificate
D.privilege
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