单项选择题
A.100℃ B.150℃ C.200℃ D.250℃
A.20%~30% B.30%~45% C.45%~55% D.55%~65%
A.1.45mm B.1.55mm C.1.65mm D.1.75mm
A.2处 B.3处 C.4处 D.5处
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