试写出周长为60cm的等腰三角形的腰长y与底边长x的函数关系式:______.
依题意,得x+2y=60,
y=60-x2=-x2+30.
故答案为:y=-x2+30.
Recently some hospitals in China have adopted ______ they call a robot-doctor, ______ will be used
to operate on patients with more accuracy.
A.what; that
B.that; which
C.what; which
D.which; what
高催乳激素血症时,溢乳是其临床表现特征之一。()