问答题

十八大报告强调的“四种危险”、“四种意识”是指什么？

答案：正确答案：“四种危险”：精神懈怠的危险、能力不足的危险、脱离群众的危险、消极腐败的危险。“四种意识”：忧患意识、创新意识...

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多项选择题

下列属于动车组制动系统特点的是（） A.
制动能力强，响应速度快 B.
制动力分配的准确性和一致性高 C.
故障导向安全 D.
制动冲击力小

单项选择题

‌For the standard F-test, which statement is correct?‍

A．the standard F-test is applicable when error terms show serial correlation
B．the standard F-test should not be used under heteroskedasticity.
C．the standard F-test should not be used when regressors show near-mulcollinearity.
D．the standard F-test should not be used in testing a single restriction.