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矩阵A=[aij]∈Rmⅹn中列向量的最大无关组的个数称为A的列秩；其行向量的最大无关组的个数称为矩阵A的行秩。

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Helen did know some things, though. Most of these she had learned from her sense of touch. She could find her way around the housE.She could recognize her family. She could play with her doll and pet the dog. She could pick flowers and help find eggs in the chickens' nests. She loved to lick the stirring spoon when a cake was madE.There was nothing wrong with her sense of taste or her sense of smell either. In fact, she loved fooD.When it came to eating, she was as healthy as anyone elsE.
Helen learned most of things from her sense of【46】. She could find her way,【47】her family, play with her doll and pet the dog, pick flowers and help find eggs in the chicken's【48】Besides, she loved to【49】the stirring spoon when a cake was madE.In fact, she was as healthy as anyone else when eating because of her interest in【50】.
多项选择题
预应力钢筋混凝土结构所使用的钢筋应该满足()的质量要求。
A、弹性模量低
B、具有一定的塑性
C、不易弯折
D、与混凝土之间有足够的粘结强度
问答题
M2M通过实现（ ）、（ ）、（ ）的通信，让机器、设备和应用与后台信息系统共享信息，对设备和资产实现有效地监督和管理。
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