问题
选择题
—Mr Jackson, _______ we go rock climbing?
—Yes, but you must use ropes. [ ]
A. must
B. should
C. need
D. can
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—Mr Jackson, _______ we go rock climbing?
—Yes, but you must use ropes. [ ]
A. must
B. should
C. need
D. can
答案：D
现场用灌砂法测定某土层的干密度，试验参数见表，试计算该土层的干密度。
题1-15表
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