阅读下面一首诗，完成下面题目。
                                                                                                                               无 题
                                                                                                                               李商隐
                                                                                                      相见时难别亦难，东风无力百花残。
                                                                                                      春蚕到死丝方尽，蜡炬成灰泪始干。
                                                                                                      晓镜但愁云鬓改，夜吟应觉月光寒。
                                                                                                       蓬山此去无多路，青鸟殷勤为探看。

如图乙是____ （填简单机械名称）它们的特点是____．

棉蚜体型微小，能附着于棉花植株上生活繁殖，以吸收棉花汁液为食．为了对棉蚜害虫进行检测，科研小组对某棉花田棉蚜种群数量进行了调查，统计结果见下表．下列说法与调查结果符合的是（　　）