判断题

采用四气门的发动机)同名气门排成两列,由一根凸轮轴通过T形件同时驱动所有气门。但因两个气门串联,会影响进气门充气效率,且使前后两排气门热负荷不均匀,故不常采用。
正确
错误

答案：正确

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文字的创造有两种方式：和。

答案：自源文字；他源文字；

多项选择题

Why 1969 was called the magic year? (More than one answer)

A．Mankind first went to the moon.
B．UNIX was born.
C．ARPANET (the precursor to the Internet) was launched.
D．Clone technology caught people’s attention.