天灾人祸是百年不遇、十年不遇的,是偶然发生的。()
参考答案:错
— Tim, you are leaving for Jiuzhaigou tomorrow.Why not pack your clothes and food up now?
— ________.[ ]
A. Good idea
B. Help yourself
C. Go ahead, please
D. Me, too
封隔器找窜施工不能使用()作为压井液。
A、清水
B、盐水
C、卤水
D、泥浆