We've got no coffee. Let's have tea _________.[ ]
A. either
B. however
C. yet
D. instead
答案:D
已知工作表中B2:F2单元格中是某个学生5门课的考试成绩,要计算其平均成绩应在其单元格中输入______。
A.=INT(B2:F2)
B.=ABS(B2:F2)
C.=COUNT(B2:F2)
D.=AVERAGE(B2:F2)
锅炉停用的时间较长时,应将煤斗原煤烧尽,防止积煤()。发现煤斗内的煤有自燃现象时,应即采取措施灭火。
A.坍塌
B.冒烟
C.自燃
D.过多