( )是债权人与债务人或第三者根据法律规定或约定而实施的，以保证债权得以实现为目的的民事法律行为。
A．担保
B．保证
C．证明
D．督促
参考答案：A
As a basic education, the primary education comes _____ local governments. [ ]
A. under the umbrella of
B. in charge of
C. in case of
D. under the ground of
滚动轴承按其所能承受的负荷作用方向和滚动体的种类可分为哪几类？
