问题
选择题
It was in the small house ___was built with stones by his father ___ he spent his childhood.
A. which; that B, that ;where C, which; which D. that; which
答案
答案：A
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It was in the small house ___was built with stones by his father ___ he spent his childhood.
A. which; that B, that ;where C, which; which D. that; which
答案：A
)（单位：m），式中k=1m-1。将一光滑小环套在该金属杆上，并从x=0处以v0=5m/s的初速度沿杆向下运动，取重力加速度g=10m/s2，下列说法正确的是
m/s 
m/s