沙漠腹地造林区土壤水分动态属灌水周期型，而不是一般的年周期型。
Dynamic of soil water cycle was rather about irrigation water cycle type than year cycle type in desert hinterland forestation area.
结果表明：在宏观经济衰退期，周期型行业较以前显著降低了债务比率；
The evidences show that cyclical industry debt decreases significantly as the macroeconomic changes from expansion to recession.
本文采用奇异积分方程方法研究了含周期型环边裂纹长圆柱的轴对称拉伸问题。
A crack problem in the case of a circular cylinder having an infinite row of circumferential cracks under tension are analyzed in this study, by the integral equation method.
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