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【单选题】
单面PCB板的焊接面一般设置为PCB板的（ ）。A.
顶层布线层
B.
底层布线层
C.
顶层丝印层
D.
底层丝印层
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A.
little
B.
many
C.
much
D.
more
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【单选题】Mary is so careful that she makes ______ mistakes in her work. [ ]
A.
few
B.
many
C.
little
D.
a little
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A.
甲状腺癌
B.
胃癌
C.
肝癌
D.
胰腺癌
E.
结肠癌
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