单项选择题

近代西方第一位提出教育心理学化思想的教育家是
A、洛克
B、卢梭
C、夸美纽斯
D、裴斯泰洛齐

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多项选择题

Which of the following statement is false?
A、A is an matrix. is a QR factorization of A. The columns of Q form an orthonormal basis for the column space of A.
B、If A=QR, where Q has orthonormal columns, then
C、A has a QR factorization, then A must be a square matrix.
D、If a matrix A has a QR factorization, then the ranks of A and Q are the same.
E、Any matrix can have a QR factorization.

单项选择题

治疗牙脱位时，应遵循的原则是

A．部分脱位牙复位固定观察
B．嵌入性牙脱位复位后2周应作根管治疗
C．完全脱位牙应于30分钟内进行再植
D．无论何种脱位牙均应进行根管治疗后再固定
E．保存患牙