已知等腰三角形的两边长是5厘米和11厘米，则它的周长是 [ ]
A．21厘米
B．27厘米
C．21厘米或27厘米
D．16厘米
答案：B
The artist spent years on his monumental painting, which covered the whole roof of the church, the biggest in the country.
A．archaic
B．sentimental
C．outstanding
D．entire
导体的电阻与电路中的电压成正比，与电路中的电流成反比。（）
