[单选题]由导线、电杆所受风压以及转角等引起的荷载是（ ）。
A.垂直荷载
B.水平荷载
C.顺线路方向的荷载
D.逆线路方向的荷载

Green space facilities (设施) are contributing to an important degree to the quality of the city environment. Fortunately it is no longer necessary that every lecture or every book about this subject has to start with the proof of this idea. At present it is generally accepted, although more as a self proved statement than on the base of a closely reasoned scientific proof. Recognizing the importance of green spaces in the city environment is a first step on the right way, this does not mean, however, that enough details are known about the functions of green space in towns and about the way in which people are using these spaces. As to this subject I shall within the scope of this lecture, enter into one aspect (方面) only, namely the recreative function of green space facilities.
The theoretical separation of living, working, traffic and recreation which for many years has been used in town and country planning, has in my opinion resulted in more attention for forms
A. to reduce the number of procreative activities
B. to attract more and more people
C. for people to use more conveniently
D. for people to do procreative activities at the street door of the house