单项选择题

In the part of research gap, we display the points that ().

A．have been studied
B．are not studied yet
C．will be studied
D．will not be studied

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多项选择题

我们在习练太极拳的过程中，应尽量做到：

A．立身中正
B．精神舒展
C．动作到位
D．劲力流畅

RTK就是实时伪距差分

答案： (1) 解析：无