消防水枪的标准口径有（）.
A.10mm、12mm和14mm
B.12mm、16mm和19mm
C.14mm、16mm和18mm
参考答案：A
—Where is Fujian ? —It’s ________________ China.
A. in the northeast of
B. to the southeast of
C. in the southeast of
简述横弯褶皱的一般特征。
