测试误差主要来自三方面:测量方法、测量仪器和测量者的测试技术。()
参考答案:对
Doctors should take special care when treating children because their breathing rate is different from _____ of adults.
A.one
B.those
C.that
D.some
在深度为5的满二叉树中,叶子结点的个数为
A.32
B.31
C.16
D.15