目前发现陡山沱组化石保存方式不包括以下哪一种？‌
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2. ______ is defined as the learner’s attitudes and aff...

单项选择题2. ______ is defined as the learner’s attitudes and affective state or learning drive.
A、Learning motivation
B、learning interest
C、learning strategy
D、learning style

最经济有效的克服土壤连作障碍的措施是______。A．无土栽培 B．嫁接 C．土壤药剂消毒

单项选择题最经济有效的克服土壤连作障碍的措施是______。

6.某尺寸的上偏差一定大于下偏差。

判断题6.某尺寸的上偏差一定大于下偏差。