后张法预应力钢筋张拉后,需进行孔道灌浆,其目的是保护预应力钢筋。()
参考答案:对
—Who is that?
—It _____ be Shirly. Only she is in red today . [ ]
A. could
B. may
C. must
a=b+1(a、b是不为零的自然数),那么a、b的最大公因数是______,最小公倍数是______.