单项选择题

中华人民共和国的社会主义经济制度的基础是生产资料的社会主义公有制，即全民所有制和劳动群众集体所有制。

A.正确
B.错误

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When starting the gas chromatograph, if the thermal conductivity cell detector is used, the following operation steps should be followed: 1. Open the carrier gas; 2. Temperature rise of gasification chamber; 3. Temperature rise of detection chamber; 4. Temperature rise of chromatographic column; 5. Open the bridge current; 6. Open the recorder, the following operation steps of is absolutely not allowed.
A、2→3→4→5→6→1
B、1→2→3→4→5→6
C、1→2→3→4→6→5
D、1→3→2→4→5→