下列有关小檗碱溶解性的论述，错误的是
A．易溶于热水 B．易溶于热乙醇C．易溶于丙酮 D．难溶于氯仿E．能缓缓溶解于水
参考答案：C
用高倍显微镜观察植物细胞有丝分裂中期的图像，全部清晰可见的结构是[ ]
A．染色体、纺锤体、细胞壁
B．染色体、赤道板、细胞膜
C．纺锤体、细胞膜、细胞核
D．纺锤体、细胞壁、核仁
In a certain cache system, the modified cache block is written to main memory only when the block is replaced. All of following are used to describe this policy EXCEPT
A．store-in
B．write-back
C．copy-back
D．write-through
