Grubbs氏法进行室内质控，只需连续测定3次，即可对第4次检验结果进行检验和控制。
参考答案：错
ORBIS doctors work very hard _______ they can help _______ more people . [ ]
A. to, even
B. so that, many
C. that, very
D. so that, much
如何理解"横墙间距"？
