论文部分内容阅读
[!--newstext--]
[!--title--]
【摘 要】
：
金钱树喜温暖湿润的半阴环境，耐干旱，忌烈日暴晒，怕寒冷和盆土积水。适宜放在客厅、窗边等通风透气的地方，可经常向金钱树的外面喷水，北方冬季室内有暖气，空气干燥，更要注意。在夏季
【出 处】
：
花卉
【发表日期】
：
2011年2期
其他文献
With the development of high-speed and heavy-haul railway in China, problems like insufficient thickness of ballast bed and overlarge track stiffness are obviou
Combining artificial neural network and multi-objective optimization to reduce a heavy-duty diesel e
Nondominated sorting genetic algorithm Ⅱ(NSGA-Ⅱ) is well known for engine optimization problem. Artificial neural networks(ANNs) followed by multi-objective o
答：压条繁殖是把母株下面的枝条或丛生花木外围的枝条按倒后埋人土中，促使其节部长出新根，然后切离母体。从而形成一株新的花苗。压条繁殖多用于一些扦插不易发根的花木。
Influences of anisotropy and inhomogeneity on supporting pressure of tunnel face with kinematical ap
Based on the active failure mechanism generated by a spatial discretization technique, the stability of tunnel face was studied. With the help of the spatial di
Ground surface displacement caused by grouting was calculated with stochastic medium theory. Ground surface displacement was assumed to be caused by the cavity
花卉图案的设计与应用贯穿我们国家整个历史,从原始社会到元明清时代,花卉图案的设计与应用逐渐发展完善。花卉图案与服装设计结合起来,既是花卉图案的自我完善,也是对花卉图
1、剪花后枝扦插 花后枝内养分含量较高，而且粗壮饱满，扦插成活后发根快，易成活。剪取枝条以早上为好。早上的花木枝条含水量充足，扦插后伤口易愈合，易生根，成活率高。