①20×14+3,
=5+3,
=8;
答:是8.
②14÷13=34;
答:这个数是34.
Mr. Brown is 70 this year. Although he is very old, ____ he works very hard.
A.and
B.but
C.so
D./
测量范围20~100℃的下限值(),上限值(),量程()。